Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

Prove that the below maths equation is true.

8 + 8 = 91

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

Evil warlock dislikes dwarfs and therefore he selects four of them and buries them. The dwarfs are buried in the ground and they are in such a way that except for their heads, their body is inside the ground. The dwarfs cannot move their body and they can view only forward. They are all buried in a line, and amongst the four, one of the dwarfs is separated by a wall. All the dwarfs are in the same direction. The last dwarfs can see two heads of friends in the front and a wall. In the last second dwarf can see one head of his friend and a wall. The second dwarf can see only the wall. The dwarf can see nothing.
Warlock comprehends the situation and tells the dwarfs that he has placed hats on their heads. There are two blue hats and two red ones. In all four dwarfs, one of them has to say what colour hat he is wearing. If the dwarf says the correct colour of the hat, they will be left free. If the answer is wrong, then they will be dug inside the ground till the very end.

What will be the answer by the dwarf and how will they answer?

Solve the riddle below:

If a Chicken says, 'All chickens are liars" is the chicken telling the truth?

Which part of London exists in France as well ?

Can you decipher the two rows to find the hidden word?